{
  "subject": "GRB 091127: optical observations",
  "eventId": "GRB 091127",
  "bibcode": "2009GCN.10207....1A",
  "createdOn": 1259499394000,
  "circularId": 10207,
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "email": "apozanen@iki.rssi.ru",
  "body": "M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy),  A. \nPozanenko (IKI) on behalf of larger GRB follow up collaboration report:\n\nWe observed the optical afterglow (Smith et al. GCN 10192) of the Swift GRB \n091127 (Troja  et al. GCN 10191) with the Z-600 telescope of Mt.Terskol \nobservatory in R-filter  on  Nov 28. In a combined images we clearly detect \nthe afterglow.\n\nThe photometry is based on the reference star used in GCN 10205  (the star \n#0710-0025176 of the USNO B1 catalog, assuming  R2=14.02):\n\nT0+     Filter, Exposure, mag.\n(d)             (s)\n\n0.7981 R 10x180  18.60 +/- 0.10\n0.9141 R 10x180  18.90 +/- 0.15\n\nThe photometry confirms the a global decay slope of ~0.8 within the first \nday after burst (Xu et al. GCN  10205)."
}